[Bug 3836] New: ProxyJump for IPv4/IPv6 conversion

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3836

            Bug ID: 3836
           Summary: ProxyJump for IPv4/IPv6 conversion
           Product: Portable OpenSSH
           Version: 10.0p2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: Simon.Richter at hogyros.de

I have a few machines that have global IPv6 addresses, but no IPv4, so
if my client is connected to an IPv4-only network, this obviously does
not work.

I currently use a "Match exec" definition with "ip route get" to
determine if there is a route to the host, and conditionally add a
ProxyJump statement with a nearby server that has both IPv4 and IPv6
connectivity if no route exists.

This feels like something that should be a declarative option, though,
probably separate for IPv4->IPv6 and for IPv6->IPv4.

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